<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        function fn() {
            var val ="男"
            return obj = Object.defineProperties({
                name: {
                    value: "老王"
                }
            }, {
                age: {
                    value: 25
                },
                sex: {
                    get: function () {
                        return val
                    },
                    set: function (a) {
                        val = a

                    }

                }
            })

        }

        var aaa = new fn()

        aaa.sex="女"
        console.log(aaa)

    </script>
</body>

</html>